i seem to be having a weird error with the latest versions of nconf...

I can edit and modify hosts, services and contacts just fine but when i try to add a host or service i get the well known (or so it seems) "Submited data is not allowed to be resent"-error.The setup ist a fairly fresh standard debian-wheezy setup with php5.4. The session-dir is writeable by the www-data user.

The Apache-Error-log shows just these 2 lines when i try to add a host, no other errors show up anywhere..